Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f163e34190d4ed…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 13:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356cb7be7ab4863498f9510da8e0d379 SHA-1: c044c7aed7a788c5ea313b8e4d90428cb13f0619 SHA-256: 66f163e34190d4ed6f1d2fc78813251c7575cdccc4696c0fcf6d37fd1439a2d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that likely serves as the lure, suggesting an attempt to redirect users to malicious content under the guise of educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=inference+worksheets+pdf+5th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_036edfe4fecf43169e19388be727cec1.pdf
    • https://static.usrfiles.com/ugd/9219f8_29c44a840c9c4973aac5a04c25ed45b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_78fe149926fd4ce983dedf685a3fd2b3.pdf
    • https://static.usrfiles.com/ugd/162fe6_9a400b102512475f8c10a7bfc583e431.pdf
    • https://static.usrfiles.com/ugd/b914b5_fd1c5103449746fcbd66d0f7c5f6584a.pdf
    • https://static.usrfiles.com/ugd/b8c837_31e591a6907047dc93217a5834b16001.pdf
    • https://static.usrfiles.com/ugd/08fe48_2524ffe7ead54176979a4a1eb7ba7be2.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b4af1d3e5da46b993c3cdf2095c5294.pdf
    • https://static.usrfiles.com/ugd/30e015_5c0e7f2d05444eadbba10d0c15290ac7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfcda2e4e5bd4a3d8b7503cf0da89f99.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d03.bin
3b9222e33aa46e6bd0bcaa8c517e0e2d842f3cbd77836b2eccbf8a09f50e0992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D03 5604 bytes
font_01_sfnt_off00007034.bin
725b9100ef12169d42ab3ef2bebf31fc7f72ffbef08f7ec000be021e979636a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7034 10176 bytes

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